21, 9, 21, 11, 21, 13, 21, ... What number should come next?
In this alternating repetition series, the random number 21 is interpolated every other number into an otherwise simple addition series that increases by 2, beginning with the number 9.
559 MCQ for effective preparation of the test of Addition Series of Logical Series section.
Read the MCQ statement: 21, 9, 21, 11, 21, 13, 21, ... What number should come next? , keenly and apply the method you have learn through the video lessons for Addition Series to give the answer. Record your answer and check its correct answer and video explanation for MCQ No. 183-12166.